Greeting, FYI, we noticed the following commit (built with clang-15): commit: 4cfbda15d6578759c0157b18698e0c10ba598856 ("fortify: Add Clang support") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: boot on test machine: qemu-system-x86_64 -enable-kvm -cpu Icelake-Server -smp 4 -m 16G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +------------------------------------------+------------+------------+ | | d3b2dc20b4 | 4cfbda15d6 | +------------------------------------------+------------+------------+ | boot_successes | 22 | 0 | | boot_failures | 0 | 22 | | kernel_BUG_at_lib/string_helpers.c | 0 | 22 | | invalid_opcode:#[##] | 0 | 22 | | RIP:fortify_panic | 0 | 22 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 22 | +------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 92.405851][ T1] kernel BUG at lib/string_helpers.c:980! [ 92.406535][ T1] invalid opcode: 0000 [#1] PTI [ 92.407149][ T1] CPU: 0 PID: 1 Comm: swapper Not tainted 5.17.0-rc2-00015-g4cfbda15d657 #1 [ 92.408207][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 92.409141][ T1] RIP: 0010:fortify_panic (fbdev.c:?) [ 92.409752][ T1] Code: 24 10 02 5b 41 5e 41 5f 5d c3 c3 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 cc c3 48 89 fe 48 c7 c7 08 f2 a9 9f e8 f3 d3 66 ff <0f> 0b 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 8d 47 d0 3c 09 77 All code ======== 0: 24 10 and $0x10,%al 2: 02 5b 41 add 0x41(%rbx),%bl 5: 5e pop %rsi 6: 41 5f pop %r15 8: 5d pop %rbp 9: c3 retq a: c3 retq b: 00 00 add %al,(%rax) d: cc int3 e: cc int3 f: 00 00 add %al,(%rax) 11: cc int3 12: cc int3 13: 00 00 add %al,(%rax) 15: cc int3 16: cc int3 17: 00 00 add %al,(%rax) 19: cc int3 1a: c3 retq 1b: 48 89 fe mov %rdi,%rsi 1e: 48 c7 c7 08 f2 a9 9f mov $0xffffffff9fa9f208,%rdi 25: e8 f3 d3 66 ff callq 0xffffffffff66d41d 2a:* 0f 0b ud2 <-- trapping instruction 2c: 00 00 add %al,(%rax) 2e: cc int3 2f: cc int3 30: 00 00 add %al,(%rax) 32: cc int3 33: cc int3 34: 00 00 add %al,(%rax) 36: cc int3 37: cc int3 38: 00 00 add %al,(%rax) 3a: 8d 47 d0 lea -0x30(%rdi),%eax 3d: 3c 09 cmp $0x9,%al 3f: 77 .byte 0x77 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 00 00 add %al,(%rax) 4: cc int3 5: cc int3 6: 00 00 add %al,(%rax) 8: cc int3 9: cc int3 a: 00 00 add %al,(%rax) c: cc int3 d: cc int3 e: 00 00 add %al,(%rax) 10: 8d 47 d0 lea -0x30(%rdi),%eax 13: 3c 09 cmp $0x9,%al 15: 77 .byte 0x77 [ 92.410056][ T1] RSP: 0018:ffff888100213c90 EFLAGS: 00010286 [ 92.410056][ T1] RAX: 0000000000000022 RBX: ffffffff9fbf5eec RCX: ffffffff9c1ce33f [ 92.410056][ T1] RDX: 0000000000000004 RSI: 0000000080000001 RDI: ffffffffa0831840 [ 92.410056][ T1] RBP: ffff888100213ed0 R08: 0001ffffffffffff R09: 0000000000000000 [ 92.410056][ T1] R10: 0001ffffa0831847 R11: 0001ffffffffffff R12: ffffffffa2a2f320 [ 92.410056][ T1] R13: 0000000000000007 R14: 0000000000000000 R15: ffffffff9fb5128b [ 92.410056][ T1] FS: 0000000000000000(0000) GS:ffffffffa0633000(0000) knlGS:0000000000000000 [ 92.410056][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 92.410056][ T1] CR2: 00007f61b2f55114 CR3: 00000003d6026002 CR4: 00000000003706f0 [ 92.410056][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 92.410056][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 92.410056][ T1] Call Trace: [ 92.410056][ T1] [ 92.410056][ T1] ni_assign_device_routes (fbdev.c:?) [ 92.410056][ T1] ? unittest_enter (fbdev.c:?) [ 92.410056][ T1] ni_routes_unittest (ni_routes_test.c:?) [ 92.410056][ T1] ? unittest_enter (fbdev.c:?) [ 92.410056][ T1] __initstub__kmod_ni_routes_test__505_604_ni_routes_unittest6 (fbdev.c:?) [ 92.410056][ T1] do_one_initcall (fbdev.c:?) [ 92.410056][ T1] ? do_initcall_level (main.c:?) [ 92.410056][ T1] do_initcall_level (main.c:?) [ 92.410056][ T1] do_initcalls (main.c:?) [ 92.410056][ T1] do_basic_setup (main.c:?) [ 92.410056][ T1] kernel_init_freeable (main.c:?) [ 92.410056][ T1] ? rest_init (main.c:?) [ 92.410056][ T1] kernel_init (main.c:?) [ 92.410056][ T1] ? rest_init (main.c:?) [ 92.410056][ T1] ret_from_fork (??:?) [ 92.410056][ T1] [ 92.410056][ T1] Modules linked in: [ 92.432241][ T1] ---[ end trace 0000000000000000 ]--- [ 92.432880][ T1] RIP: 0010:fortify_panic (fbdev.c:?) [ 92.433440][ T1] Code: 24 10 02 5b 41 5e 41 5f 5d c3 c3 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 cc c3 48 89 fe 48 c7 c7 08 f2 a9 9f e8 f3 d3 66 ff <0f> 0b 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 8d 47 d0 3c 09 77 All code ======== 0: 24 10 and $0x10,%al 2: 02 5b 41 add 0x41(%rbx),%bl 5: 5e pop %rsi 6: 41 5f pop %r15 8: 5d pop %rbp 9: c3 retq a: c3 retq b: 00 00 add %al,(%rax) d: cc int3 e: cc int3 f: 00 00 add %al,(%rax) 11: cc int3 12: cc int3 13: 00 00 add %al,(%rax) 15: cc int3 16: cc int3 17: 00 00 add %al,(%rax) 19: cc int3 1a: c3 retq 1b: 48 89 fe mov %rdi,%rsi 1e: 48 c7 c7 08 f2 a9 9f mov $0xffffffff9fa9f208,%rdi 25: e8 f3 d3 66 ff callq 0xffffffffff66d41d 2a:* 0f 0b ud2 <-- trapping instruction 2c: 00 00 add %al,(%rax) 2e: cc int3 2f: cc int3 30: 00 00 add %al,(%rax) 32: cc int3 33: cc int3 34: 00 00 add %al,(%rax) 36: cc int3 37: cc int3 38: 00 00 add %al,(%rax) 3a: 8d 47 d0 lea -0x30(%rdi),%eax 3d: 3c 09 cmp $0x9,%al 3f: 77 .byte 0x77 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 00 00 add %al,(%rax) 4: cc int3 5: cc int3 6: 00 00 add %al,(%rax) 8: cc int3 9: cc int3 a: 00 00 add %al,(%rax) c: cc int3 d: cc int3 e: 00 00 add %al,(%rax) 10: 8d 47 d0 lea -0x30(%rdi),%eax 13: 3c 09 cmp $0x9,%al 15: 77 .byte 0x77 To reproduce: # build kernel cd linux cp config-5.17.0-rc2-00015-g4cfbda15d657 .config make HOSTCC=clang-15 CC=clang-15 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules make HOSTCC=clang-15 CC=clang-15 ARCH=x86_64 INSTALL_MOD_PATH= modules_install cd find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k -m modules.cgz job-script # job-script is attached in this email # if come across any failure that blocks the test, # please remove ~/.lkp and /lkp dir to run from a clean state. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang